The best sound / price ratio of all mentioned above would be the Kingko KA-101 Pro. Outstanding performance with both the Klipsch Heritage and Reference lines. Icing on the cake is a world class headphone output.
https://www.dagogo.com/kingko-audio-ka-101-integrated-amplifier-review/
https://www.dagogo.com/kingko-audio-ka-101-integrated-amplifier-review/